Valve-movement.



C. W. CARROLL.

VALVBMOVEMENT.

APPLICATION FILED JUNE 2, 1914.

1,124,851, Patented Jan.12, 1915.

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swoon H201 THE NORRIS PETERS ca. PHOTO-LITHQ. WASHINGTON. D. Cv

C. W. CARROLL.

VALVE MOVEMENT.

APPLIOATION FILED JUNE 2, 1914.

1,124,857. Patented Jan.12,1915.

2 SHEETS-SHEET 2.

I fiimi ies Way/Z 22 MW 1 M 5W0 THE NORRIS PETERS CO). PHOTO-LITHQ, WASHING rON, D4 0.

CHARLES w. CARROLL, or CELINA, onto, AssIonoRoF or onmnaonro.

ONE-HALF 1 0 JOHN ANAPK VALVE-MOVEMENT.

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Application filed June 2, 1914. Serial No. 842,442.

To all whom it may concern:

. Be it known that 1, CHARLES W. CARROLL,

a citizen of the United States, residing at, Celina, in the county of Mercer and State of Ohio, have invented new and useful Improvements in Valve-Movements, of which the following is a specification.

This invention relates to a valve gear for steam engines and in particular to a reversible gear which may be operated to reverse the valve, at the required point of travel of the piston in such a manner that the motive fluid will, be used to the greatest advantage in reversing the motion'of the engine.

The primary object of the invention is to provide a valve gear of this character which includes a shifting link and means associated therewith whereby the valve will be accelerated in its movement in opening the intake port in either end of the cylinder, as

the piston approaches the corresponding end of its stroke, to afford the desired outside lead to the valve when the engine is running in either direction.

A further object is the provision in a gear construction of the class set forth of adjustable means for connecting the valve stem with the shifting link, whereby the lead may be varied fromv time to time as may be found necessary in practice.

The invention consists in the features of construction, combination, and arrangement of parts hereinafter fully described and claimed, reference being bad to the" accompanying drawings, in which'.''

Figure 1 1s a side elevation of a steam enbeing shown in longitudinal section, and the piston being at one end of its stroke with the guide member for the reversing block set in position for movement of the engine crank in one direction; Fig. 2 is a front elevation of the same; Fig. 3 is a top plan view; and Fig. i is a side elevation similar to Fig. 1, the piston being shown midway in its return stroke, the position of the guide member'for the reversing block also being shown in dotted lines in its reversed position.

In the drawings, the valve gear is shown as being applied to a simple steam engine having a D slide valver It is to be understood, however, that the gear may be embodied in the construction of various other Specification of Letters Patent.

Patented amie, 191 15.,

latter is provided with forwardly and rearwardly projecting arms 6 and? mounted for horizontal slidingv movement within the guide brackets 8 and 9 respectively on the frame of the engine. The reversing shaft 10 of the engine is mounted above the crank shaft in the bearings 11, and has its longitudinal aXis arranged in a vertical plane with the axis of the crank shaft. This reversing shaft is provided with an adjusting lever 12 {which is adapted to be secured in angularly adjusted position by means of releasable locking member13 and the rack segment 14:. An elongated guide member 15 issecured fixedly to the end of the reversing shaft 10 adjacent to the eccentric on the crank shaft. This guide member is provided witha longitudinalguideslot 16, whose longitudinal axis intersects the axis of the shaft 10, for the reception of a slidingblock 17 which is adapted to reciprocate within the slot. This slide block is pivotally mounted upon "the upper end of a shifting link 18 whose lower end is pivotally connected with-the eccentrio yoke 4:. The shifting link is provided with a longitudinal slot 19 in which a longitudinally adjustable pin 20 is mounted. Clamping nuts 21 are adapted to secure the said pin in adjusted positionwithin. the link slot and the connecting "rod 22 associated with the valve stem '23 is pivotally con nected with the pin. The eccentric is set upon the crank shaft with its axis disposed opposite to the crank pin of the engine cranln p j r The operation of the device will now be described. Referring particularly to Fig.

1 of the drawing, it will be seen that the wardly and to the left as the crank descends through the lower left hand quadrant of its movement. This will cause the lower end of the shifting link 18 to move upwardly and to the left also upon the adjacent pivot. The guide member 15 having been set by adjustment of the reversing shaft 10 in. a diagonally extending position wherein its upper end projects to the right, the slide block 17 will move upwardly and to the right. The movement of this slide block is rectilinear, whereby the pivot pin 20 for the connecting rod 22 will move to the right, or to the predominating degree of movement of the slide block. Therefore, as the engine crank moves through this quadrant, the connecting rod 22 for the valve stem will move to the right slowly in completing the opening of the steam port at in the engine cylinder, which in this instance is the intake port. As the crank proceeds through the next lower quadrant, the eccentric yoke will move downwardly and to the left, drawing with it the lower end of the shifting link. In this instance, the upper end of the link and the slide block 17 will move downwardly in the general direction of movement of the lower end of the link, thereby increasing the speed of the connecting rod and consequently the valve itself. The opposite port 25 of the cylinder will thus be opened speedily, and just before the piston reaches the opposite end of its stroke, thereby affording the desired lead. The variable motion of the slide valve will be repeated as the engine crank moves through the other quadrants. The valve may be set initially to aiford the desired degree of lead by adjusting the pin 20 within the link slot, wherein it is secured in adjusted position by means of the nuts 21. Another feature of the operation of the gear is the manner in which it facilitates the reversing of the engine. When the reversing lever is thrown into the position shown in dotted lines inFig. 4% of the drawings, the guide member 15 will assume a position at right angles to its original position, which is at an angle of 45 to the vertical. The shifting link will thus be thrown to the right or to the left into its opposite horizontal position, depending upon the position of the engine crank, so that the valve will be shifted to reverse the direction of the motive fluid. The steam will be admitted suddenly into the opposite port of the cylinder owing to the accelerated movement of the shifting link, and the fluid acting upon the opposite side of the piston head will be exhausted, and thus avoid any counteracting effect of the steam upon both sides of the piston.

From the foregoing description, taken in connection with the accompanying drawings, it should be apparent that l have provided a valve gear which is extremely simple in construction, so as to be durable, efficient in operation, and not-apt to get out of order while in use. The device aifords a quick reverse and an efficient valve opera tion where in the lead may be varied whenever necessary. lt is to be understood, however, that minor changes in the mechanical details of construction, such as fall within the scope of the appended claims, may be resorted to in practice.

What is claimed is:

1. In an engine of the class described including a crank shaft, a piston associated therewith, a cylinder for the piston, a movable valve for the cylinder and a valve stem 5 connected to the valve, the combination of an eccentric mounted fixedly upon the crank shaft, a yoke mounted upon the eccentric, means for securing the yoke against rotary movement, a shifting link having one end 1 r pivotally connected to the said yoke, a con necting rod pivotally connected with the link intermediate of its ends and having connection with the valve stem, and means for guiding the opposite end of the said link in a straight line disposed tangential to the crank shaft.

2. In an engine of the class described including a crank shaft, a piston associated therewith, a cylinder for the piston, a movable valve for the cylinder and a valve stem connected to the valve, the combination of an eccentric mounted fixedly upon the crank shaft, a yoke mounted upon the eccentric, means for securing the yoke against rotary movement, a shifting link having one end pivotally connected to the said yoke, a con necting rod pivotally connected with the link intermediate of its ends and having connection with the valve stem, a stationary support, a guide member mounted upon the support and having a straight slot disposed tangential to the crank shaft, and a slidable member engaged within the said slot and being connected pivotally with an opposite end of the said'link.

3. In an engine of the class described in- .cluding a crank shaft, a piston associated therewith, a cylinder for the piston, a movable valve for the cylinder and a valve stem connected to the valve, the combination of an eccentric mounted fixedly upon the crank shaft, a yoke mounted upon the eccentric, means for securing the yoke against rotary movement, a shifting linkhaving one end pivotally connected to the said yoke, a connecting rod pivotally connected with the link intermediate of its ends and having connection with the valve store, a stationary support, a guide member mounted upon the support and having a straight slot disposed tangential to the crank shaft, a slidable member engaged within the said slot and being connected pivotally with the opposite end of the said link, the said guide member being adjustably mounted upon the support with its axis of movement parallel to the said shaft, and means by which the guide member may be secured in angularly adj usted position.

I. In an engine of the class described including a crank shaft, a piston associated therewith, a cylinder for the piston, a movable valve for the cylinder and a valvestem connected to the valve, the combination of an eccentric mounted fixedly upon the crank shaft, a yoke mounted upon the eccentric, means for securing the yoke against rotary movement, a shifting link having one end pivotally connected to the said yoke, a connecting rod pivotally connected with the link intermediate'of its ends and having connection with the valve stem, means for guiding the opposite end of the said link in a straight line disposed tangential to the crank shaft, the said connecting rod being adjustably connected with the shifting link, and means by which the rod may be secured to the link in adjusted position.

5. In an engine of the class described including a crank shaft, a piston associated therewith, a cylinder for the piston, a movable valve for the cylinder and a valve stem connected to the valve, the combination of an eccentric mounted fixedly upon the crank shaft, a yoke mounted upon the eccentr c, means for securing the yoke against rotary movement, a shifting link having one end pivotally connected to the said yoke, a connecting rod pivotally connected with'the link intermediate of its ends and having Copies of this patent may be obtained for connection withthe valve stem, means for guiding the opposite end of the said link in a straight line disposed tangential to the crank shaft, the shifting link being provided with a longitudinal slot, a pivot pin.

therewith, a cylinder for the'piston, a movable valve for the cylinder and a valve stem connected with the valve, the combination of an eccentric mounted fixedly upon the crank shaft, a yoke mounted upon the e0 centric, a supporting bearing, a guide member mounted within said bearing for recip-Z rocation and having a straight guide slot disposed atright angles to'the axis of movement of theguide member for the slidable reception of the eccentric yoke, an elongated shifting link having one end connected pivotally with said yoke, a connecting rod having pivotal connection with the link intermediate thereof and being connected with the valve stem, and means for guiding the opposite end ofthe link in a straight line tangential to the crank shaft.

In testimony whereof I afiix my signature in presence of two witnesses.v

Witnesses: B. A. MYERS, J. J. ZUMWALD.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

